Fault tree analysis is a method for both reliability assessment and fault diagnosis. Generally, the deductive method is adopted in the construction of fault tree model. In this way, some of the undesired events may be omitted. This paper provides an inductive method. It is based on the working principle and system theory. Other than the deduction method, the method starts from the study of the failure modes of parts and then works up to analyze their influences on the subsystems. The

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... ps between the events and subsystems are illustrated by a nested structure. The induction sequence and process are also demonstrated. This method proved to be an effective way for the construction of fault tree.